US6548951B1ExpiredUtilityPatentIndex 43

Deflection unit for a cathode ray tube and method of manufacturing a saddle-shaped deflection coil

Assignee: KONINKL PHILIPS ELECTRONICS NVPriority: Nov 17, 1999Filed: Nov 17, 2000Granted: Apr 15, 2003

Est. expiryNov 17, 2019(expired)· nominal 20-yr term from priority

Inventors:PIEK HANS PENNINGA JOHANNES VINK NICOLAAS GERRIT

H01J 2229/7033H01J 9/236H01J 29/762H01J 29/76

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Claims

Abstract

A deflection unit ( 4 ) includes a saddle-shaped deflection coil ( 30 ). The deflection coil includes at either the front or rear end a concave part having a left and right corner ( 41, 42 ) which define a line ( 43 ). The concave part is flanked at either side by adjacent portions ( 38, 39 ). It holds that: α>β where α angle between a line ( 43 ) through the two corners ( 40, 41 ) of the concave part ( 40 ) and inner windings of the concave part ( 40 ), and β is an angle between said line ( 43 ) and the inner windings at the outer side of a corner ( 41,42 ).

Claims

exact text as granted — not AI-modified

What is claimed is:  
     
       1. A deflection unit ( 4 ) having at least one saddle-shaped coil ( 6 ,  7 ,  15 ,  15 ′) having coil portions, and winding windows ( 19 ,  22 ), the coil portions comprising a front end portion ( 8 , 9 ,  16 , 17 ) and a rear end portion ( 11 ,  12 ), at least one of the end portions having a part ( 18 ,  28 ,  40 ) which has a concave shape between two corners ( 20 ,  21 ,  41 ,  42 ), characterized in that the following relation holds for the part ( 18 ,  28 ,  40 ) having a concave shape: 
       
         
           α&gt;β 
         
       
       where α is an angle between a line ( 43 ) through the two corners ( 40 ,  41 ) of the concave part ( 40 ) and inner windings of the concave part ( 40 ), and  
       β is an angle between said line ( 43 ) and the inner windings at the outer side of a corner ( 41 ,  42 ).  
     
     
       2. A deflection unit as claimed in  claim 1 , characterized in that β is smaller than 10°. 
     
     
       3. A deflection unit as claimed in  claim 2 , characterized in that β is approximately 0°. 
     
     
       4. A deflection unit as claimed in  claim 1 , characterized in that α is more than 20°. 
     
     
       5. A deflection unit as claimed in  claim 1 , characterized in that the front end portion comprises the part which has a concave shape. 
     
     
       6. A deflection coil for a deflection unit as claimed in  claim 1 .

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